Java control flow: Don't allow extracting method if there's a potential side effect on the local variables in the case of exception thrown (IDEA-79444, IDEA-159916)

java/java-tests/testData/refactoring/extractMethod/UseVarInCatchInvisible.java

@@ -0,0 +1,18 @@
+class A {
+    void foo() {
+        String s = null;
+        try {
+            s = "1";
+            <selection>int invisibleOutsideTry = 1 + 1;
+            bar();</selection>
+            s = s + invisibleOutsideTry;
+        } catch (Exception e) {
+            System.out.println("ex " + s);
+        }
+        System.out.println("ok " + s);
+    }
+
+    private void bar() throws Exception {
+        throw new Exception();
+    }
+}